Does quantum support multi-nic setup ?

Host setup :

Host B :
- Only nova-network and q-agt
- nova.conf from HostA copied over to HostB, and references for localhost replaced pointing to HostA (mysql, rabbit etc)
- Also updated sql_Connection entry in /etc/quantum/plugins/openvswitch/ovs_quantum_plugin.ini to point to HostA

I have not added multi-host flag to my nova.conf (Should I ????)

Network Setup :

created two networks for "demo" tenant using "nova-manage network create" 10.0.8.0/24 and 10.0.9.0/24
Associated 10.0.9.0/24 with HostB using "nova-manage network modify --host"

Launched an instance for demo tenant - VM gets two fixed IPs, one each from 10.0.8.x and 10.0.9.x networks.

"I have not added multi-host flag to my nova.conf (Should I ????)" - no. QuantumManager won't do anything with this flag, as this mode is unsupported, as mentioned in the "Limitations" section.

"Associated 10.0.9.0/24 with HostB using "nova-manage network modify --host"" - this won't do anything (and may break things). Again, there is no notion of running nova-network on multiple hosts with Quantum in Essex.

I am also facing a similar issue, when an instance gets created on Compute host (on physically diff server than Network server), the dhcp lease fails. But, when an instance is created on the Controller node, the networking works fine (able to ping to the floating ip).

My set up is as follows:
Controller Node : has all services running.
Compute host: has Compute and Quantum agent service running

This is pretty standard devstack config - using Quantum and nova_ipam. Other details explained in original question.

Are you looking for specific config param ?

"there is no notion of running nova-network on multiple hosts with Quantum in Essex."

Does this mean if specific use case requires multiple networks, all of them should be managed by single nova-network process ? Or that user should NOT choose Quantum Network Manager ? (opt for say VlanManager) and have multiple nova-network processes.

Is there a plan to support multiple nova-networks with quantum - in Folsom ?